imx-lib: bump to version used in 4.9.88-2.0.0_ga

imx-lib: bump to version used in 4.9.88-2.0.0_ga

In the latest release from NXP, Yocto Rocko 4.9.88-2.0.0_ga,
imx-lib was switched from a specific branch or tag release to the
master branch and a specific commit. See the link below for
reference.

https://source.codeaurora.org/external/imx/meta-fsl-bsp-release/commit/?h=rocko-4.9.88-2.0.0_ga&id=ded1a9ea3d723c56058524fc9ebd420a3510ae05

Signed-off-by: Dan Riegsecker <1baldgeek@gmail.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>